Wave pattern in UBL

[bjoernbusch]

I see this when I look at the bed level using UBL 10x10:

I have been trying to figure this out for quite a while now, but I can't pinpoint it. I've exchanged the rolls, taken apart the printer 3 times and made sure everything runs smooth and is angled properly. I've tested the BLtouch with the accuracy command and it looks fine. I'm using the standard Ender 3 v2 glasbed, which I know has a dip in the middle, but not a wave pattern. When I rotate it 90 degrees, I get a similar pattern, when I use another FR4 bed, it's also similar, so it must be something else.

Any hints from anybody?

[darco415]

I wouldnt put too much emphasis on getting a perfectly flat surface when you have a BLT. I mean thats what its for.